InternetCallerTests.cs

using System.Net;
using System.Net.Http;
using System.Threading;
using System.Threading.Tasks;
using FluentAssertions;
using HttpClientTest.Class;
using Moq;
using Xunit;

namespace HttpClientTest.Tests
{
    public class InternetCallerTests
    {
        [Fact]
        public async Task GivenAConfiguredHttpClient_WhenCallingAUrlAndTheResultIsTheExpectedResult_ThenTrueIsReturned()
        {
            // Arrange
            var httpClient = new HttpClient(new OkMessageHandler());
            var factoryMock = new Mock<IHttpClientFactory>();
            ICallTheInternet subject = new InternetCaller(factoryMock.Object);
            
            // Act
            var result = await subject.GetWithClient(httpClient, "https://example.com", HttpStatusCode.OK);

            // Assert
            result.Should().BeTrue();
        }

        [Fact]
        public async Task GivenAHttpClientFactoryConfiguredWithNamedHttpClient_WhenCallingAUrlAndTheResultIsTheExpectedResult_ThenTrueIsReturned()
        {
            // Arrange
            var httpClient = new HttpClient(new OkMessageHandler());
            var factoryMock = new Mock<IHttpClientFactory>();
            ICallTheInternet subject = new InternetCaller(factoryMock.Object);

            var clientName = "TestClient";

            factoryMock.Setup(f => f.CreateClient(clientName)).Returns(httpClient);
            
            // Act
            var result = await subject.GetWithNamedClient(clientName, "https://example.com", HttpStatusCode.OK);

            // Assert
            result.Should().BeTrue();
        }

        internal class OkMessageHandler : DelegatingHandler
        {
            protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
            {
                return Task.FromResult(new HttpResponseMessage(HttpStatusCode.OK));
            }
        }
    }
}